You got a negative trust rating because you've hyped bogus and deceptive security claims multiple times and tried to charge people for exploit tools that didn't. But hey, you could still collect on that 50 BTC bounty I offered you for your last set of claims, and I'll even remove the negative trust to boot.
He also claims to have found a flaw in Nxt and wanted money before he writes the code to exploit it.
https://bitcointalk.org/index.php?topic=345619.msg5663483#msg5663483